Figure 4

Determination of the N–V orientation. (a) Fluorescence image (scale bar 10 μm), (b) schematic of the relative angle of the N–V axis to the applied magnetic field and (c) corresponding ODMR spectra. Red and green plots in (c) represent ODMR spectra with and without a 28 Gauss external magnetic field. With the field applied, Zeeman splitting is observed between the two peaks at 2801 and 2948 MHz. (d) ODMR spectra with acquisition times of (1) 5 s, (2) 10 s, (3) 20 s and (4) 50 s. Spectra have been fitted with two Lorentzian functions.